Effect of self-cementing properties on the mechanical behaviour of recycled concrete aggregates in unbound pavement layers

• Published in: Transportation Geotechnics
• Main Authors: Wang, Chong, Chazallon, Cyrille, Jing, Peng, Hornych, Pierre, Latour, Benjamin
• Other Authors: Laboratoire des sciences de l'ingénieur, de l'informatique et de l'imagerie (ICube), École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)-Université de Strasbourg (UNISTRA)-Institut National des Sciences Appliquées - Strasbourg (INSA Strasbourg), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Les Hôpitaux Universitaires de Strasbourg (HUS)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Beijing University of Technology, Laboratoire Auscultation, Modélisation, Expérimentation des infrastructures de transport (MAST-LAMES ), Université Gustave Eiffel
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2023
• Subjects: Recycled concrete aggregates; Self-cementing properties; Permanent deformations; Resilient modulus; Repeated load triaxial test; [SPI]Engineering Sciences [physics]; Avery; Orca
• Online Access: https://hal.science/hal-04370195; https://hal.science/hal-04370195/document; https://hal.science/hal-04370195/file/chon%20wang%20-%20TRGEO%20-%20final.pdf; https://doi.org/10.1016/j.trgeo.2023.101054

International audience Recycled concrete aggregates (RCA) are increasingly being used in pavementbase and subbase layers to replace the natural unbound granular materials (UGM), while theinfluence of their self-cementing properties on the mechanical behaviour has not beenthoroughly studied. In this paper, the self-cementing properties, permanent deformation andresilient deformation behaviour of two RCA, NRCA and ORCA, showing significantlydifferent self-cementing properties, after curing for different times (1, 180, 360 and 720 days),were investigated by pH value measurements, calorimeter tests and repeated load triaxial tests(RLTT). The results show that the self-cementing properties can significantly improve themechanical behaviour of RCA, which is comparable to that of lightly treated materials. Thepermanent deformations of NRCA, showing strong self-cementing properties, decreases to avery low value quickly after curing for 180 days, and then stabilizes. While the resilientmodulus of NRCA increases continuously with curing time, up to the studied curing time (720days), 4.3 times larger than that curing for 1 day. It was also found that the traffic loads candamage the bonds between particles formed due to the self-cementing properties. On thecontrary, for ORCA, showing negligible self-cementing properties, curing has no influence onthe mechanical behaviour.